DE102010045085B4 - Length adjustable drawbar, truck trailer hoist and door for a box body of a truck trailer hoist - Google Patents

Abstract

Length-adjustable drawbar (6) for a truck trailer with a towing vehicle (1) carrying a box body (2) and in which at least the rear wall of the box body can be opened, and a trailer (4), which also a Kofferbauch the rear wall openable are, wherein the motor vehicle (1) and the trailer (4) via the variable length drawbar (6) are connectable to each other, characterized in that the variable length drawbar (6) an outer tube (7) and a fixedly connected to the outer tube inner Tube (8) and an intermediate, longitudinally displaceable relative to the outer and inner tube middle tube (9).

Description

The invention relates to a variable-length drawbar according to the preamble of claim 1, a truck trailer train with such a drawbar and a door for a box body for such a truck trailer drawbar.

Box bodies with appropriate through-loading are known in different versions. So shows DE 20 2009 016 356 U1 a trailer, in which the Durchfahrmöglichkeit is made by the fact that the towing vehicle and equipped with an extendable drawbar trailer for purposes of loading and unloading are pulled apart and the passage or Überfahrmöglichkeit is made by a tailgate flap as a bridge between Motor car and trailer serves. So that the tail lift, which is adapted here to the cargo hold height of about 2.4 m, can serve as a drive-over bridge, the towing vehicle and trailer must be pulled apart until the distance between the two vehicles corresponds to the tailgate length.

A disadvantage of this design is in particular that as a transfer device an elaborate tail lift is required.

Furthermore, it is off DE 20 2009 010 516 U1 a trailer train is known, are approximated in the motor vehicle and trailer for transferring the total train of a drive mode in a charging mode to each other. The approach takes place here via a hydraulically adjustable drawbar, wherein the adjustment is made via a hydraulic motor. As front and rear gates on the box bodies here either roller doors or doors are provided.

A disadvantage of this design is on the one hand, the complex and costly type of drawbar adjustment and the way the interaction of front and rear door: When using roller doors, as seen in the direction of travel front side of the bodies, the necessary stability and driving safety while driving , especially when braking, problematic. When using gullwing doors in particular opening in the direction of interior construction is possible only in the discharged state.

A disadvantage of both solutions is also that a loading and unloading is not provided for set up Wechselkofferaufbauten.

Also, the possibility of retrofitting the rigid drawbar trailer with a variable-length drawbar according to one of the solutions listed is possible only with uneconomical high effort.

Out DE 2452587 A1 is a variable length towing bar is known in which two telescopically telescoping tubes are used, which are tension and compression-resistant connected in the extended state. With a locking pin, the pipes can be fixed against each other. It is therefore a tow bar to replace a tow rope. A transition between two loaded - or to be loaded - vehicles is not provided.

A similar device shows FR 1 124 718 A. , However, this is a spacer with adjustable distance, which is to be used in a Seilabschleppvorgang.

Out DE 71 16 406 U is a vehicle with arranged in the wall of the box-shaped structure door known. The door consists of at least one upper and one lower part, wherein the lower part has on its underside guide pins, which cooperate with the guide rails being constructed. To open the door, the upper part of the door is pivoted hydraulically outwards about a rotation axis located on the upper side of the upper part. The guided in the guide rails guide bolts move forcibly upwards and cause a collapse of Tuerber and door base and thus the opening of the door.

A disadvantage of this door is that the door elements can not be used for a truck trailer tow with variable length drawbar, as a pivoting of the door elements in the direction of the interior of the box body is not provided and the door always protrudes by a portion of its length on the structure. Furthermore, it is disadvantageous that a mechanical or manual solution for opening the door is not provided and the door on a parked box body, which is separate from the power supply, can not be opened.

It is also known DE 2735382 A1 a zippered tarpaulin for trucks. Although a cable pull solution is provided with which the slide of the zippers can be pulled up, at the same time open the located on the sides of the rear tarpaulin zippers and pulling the attached between the outer zippers cover is pulled up, but this cable solution is neither intended nor suitable to open a door consisting of fixed door elements.

The present invention is therefore based on the object to provide an improved variable-length drawbar for a tow truck consisting of towing vehicle and trailer. A Another object of the invention is a truck trailer train, which consists of a motor vehicle and a trailer, with both the towing vehicle and the trailer carry a box body to connect via a variable length drawbar. Furthermore, it is an object of the invention to provide a door for a box body of a variable-length drawbar interconnected truck trailer train.

Motor vehicle and trailer should be able to be easily transferred from a drive into a charging mode; Subsequently, the loading and unloading process, regardless of whether the structures are on the towing vehicle or the trailer chassis or whether they are connected in the parked state with each other and / or with a loading ramp, can be performed.

The object of the invention is achieved by a variable-length drawbar with the features of claim 1, a truck trailer with the features of claim 7 and a door for a box body with the features of claim. 9

In particular, a Zentralachsanhänger can be equipped with such a collapsible drawbar. The use of, in particular hydraulic, drive components can be dispensed with. Furthermore, special components are largely dispensed with and resorted to known from the trailer technology standard components, such as an additional standard coupling pin, spring wings, compression springs and wear plates from the parts warehouse conventional automatic trailer hitches.

The drawbar according to the invention allows in a simple manner the pushing together of towing vehicle and trailer. It is advantageous that the load is particularly secure against theft when the rearmost structure is docked to the loading dock of a logistics center consisting of a building and access to the rearmost sectional door is possible only from inside the logistics center. The cargo located in the box body block in addition to the internal locking the pivoting of the folding door.

As far as it is in the superstructures to be placed on supports box bodies, it is possible to separate the suitcases after pushing together from the towing vehicle or the trailer chassis and set down on unterzubauende or auszuschwenkenkende Abstellstützen. The motor vehicle and the trailer chassis can then proceed in the direction of travel through the tunnels formed by parking supports and box bodies. The superstructures can be left individually, as far as the trailer's box body has been parked, or together, directly behind one another. It is advantageous that any length chains can be formed from successive structures. Even with such box body chains the rear, usually easy to open, sectional door is not accessible by the structure standing in front and thus secured. Access to the entire chain of superstructures is possible only through the rearmost structure.

Preferably, the three tubes of the drawbar each have at least one located at the top of the tubes bore, preferably the tube assembly is associated with a movable, retracted from a retracted into the holes detent position in a drawbar release position sliding coupling pin. In this case, the bores are preferably arranged on a common central axis (M1), wherein the center axis of the bore of the middle tube (M2) lies in the driving mode on the central axis (M1) of the holes then in alignment.

The middle tube preferably has, in the region in front of the bore, a thickening which raises the coupling pin when the middle tube is pushed in, displacing the coupling pin drawn and locked out of the bore region of the bores of the inner and middle tube into a position releasing its lock. It is advantageous if the thickening is designed as a replaceable wear plate.

The invention also relates to a truck trailer with a towing vehicle, which carries a box body, and in which at least the rear wall of the body can be opened, and a trailer, which also carries a box body and in which both the front wall and the rear wall are openable and wherein the towing vehicle and the trailer are connected to each other via a variable-length drawbar. The construction of motor vehicle and / or trailer is preferably designed as a removable box body.

Another embodiment of the invention relates to the design of a box body with a special folding door in the front and a known per se Sektionaltor in the rear area. This combination allows the self-sufficient discharge of the parked structures from the rear side. Initially, the rear sectional door is opened. Subsequently, the loading space loaded, for example, with pallets is unloaded. Once the load compartment of the rear body is empty, the folding door in the front wall within the cargo space can still be pivoted up and then open the then accessible sectional door of the front body. In the same Way then the cargo space of the front box body to the rear, through the rear structure through discharged.

It is also advantageous that by the option of offsetting consecutive structures together, new logistics concepts are made possible. For example, it is possible to park two superstructures one behind the other in front of a loading ramp, and then to drive with the towing vehicle and trailer chassis to already unloaded superstructures, to pick them up and then to handle the next job. In this case, the driver does not have to wait for the unloading of his first loaded train and is also independent of other warehouse personnel or their business hours. In addition, only one loading ramp is occupied by putting together a plurality of box bodies, or eliminates an intermediate transfer of a swap body by the driver with only one existing loading door.

It is advantageous if, in the case of the door pivotally mounted in the front area below the box body roof, the at least two door elements are connected to one another via a hinge. The leadership of the door when pivoting takes place in an advantageous manner by laterally attached to the underside of the lower door element guide pin, which cooperate with a mounted on the side wall, vertical guide rail and forcibly control the up and down movement of the collapsible door elements.

It is advantageous if the folding and upward pivoting of the door elements by pulling a rope, referred to below as pulling rope is effected, which is in the interior of the box body above the folding door with another rope, hereinafter called hoist rope, T-shaped and so that the tensile force is evenly distributed to the two branching strands of the hoist.

In this case, the branching strands are performed in an analogous manner above the folding door to the upper box body corners mounted baffles, preferably pulleys, and from there to the side of the folding door along down and around the laterally attached to the underside of the lower door element guide bolts around and back up to fixed attachment points located in the area of the upper corners of the folding door. The pulling of the pull rope causes a uniform pulling on the strands of the hoisting rope and thus lifting the guide pin and the whole folding door, with the door elements interconnected by a hinge, due to the forced guidance of the guide pin mounted on the lower door element in the on the side wall the trunk structure located, vertical guide rails, more and more merge and finally hang in the form of a compact package below the box roof.

It is advantageous if the towing rope from the point of attack on the hoist rope, guided by guide means, preferably guide rollers, below the box body ceiling about 2 meters away from the folding door and in this area has a locking device with one on the ceiling the counterweight attached to the suitcase body cooperates and fixes the upwardly pivoted door elements after latching and thus holds the hinged door under the boot lid, folded up.

It is advantageous if the lower door element engages in a completely pivoted-out position in a groove located in the bottom of the box body and so gives the closed door additional stability. The force exerted by a, for example, moving during the trip and pushing against the folding door charge can be compensated so better than a door that does not engage the box body floor groove.

It is also advantageous if the folding of the door elements connected to one another via a hinge is blocked by the actuation of a blocking element and the door can thus be locked in the pivoted-out position.

The invention will be explained in more detail with reference to an embodiment illustrative drawing.

It should be noted that the special door construction according to claims 9-14 can also be used in trucks without length-adjustable drawbar, for example in truck trailer trains, in which the connection between the truck and trailer is made with a folding liftgate or a flap.

Show it:

1 a truck with a coupled thereto, a drawbar according to the invention contained, trailer in the driving mode

2 a drawbar according to the invention in the driving mode

3 a truck with a coupled thereto, a drawbar according to the invention contained, trailer in the loading mode

4 a drawbar according to the invention in the loading mode

5 a detailed view of the drawbar according to the invention during the displacement process

6 a detailed view of the drawbar according to the invention with a locked hitch

7 a jacked box body in side view with high tilted folding door.

8th a box body in the view from above.

9 a mounted box body in side view with hinged down folding door.

10 a detailed view of the box body in side view with the hinged down and locked folding door in the groove located in the bottom.

1 shows a schematic representation of a trailer with a towing vehicle 1 and a trailer 4 , motor car 1 and followers 4 each carry a box body 2 , where the case construction 2.1 mounted on the towing vehicle and the box body 2.2 on the trailer. Motor car and trailer are about a variable-length drawbar 6 interconnected, detailed in 2 is shown. In the rear area of the box bodies 2 there is a sectional door 3 and in the front a folding door 5 through which the vehicles can be loaded and unloaded.

2 shows the variable-length drawbar 6 that the trailer 4 assigned. But it is also possible, the drawbar 6 as a replacement part, allowing them as needed in a trailer 4 can be used or installed instead of a non-extendable drawbar.

The drawbar 6 represents a tubular structure, wherein the tubes are preferably square tubes, in which a total of three concentric tubes 7 . 8th . 9 available. The middle tube 9 is opposite the outer tube 7 , which with the inner tube 8th is immovably connected, telescopically movable, but also fixable. The outer and the inner tube 7 respectively. 8th form a firmly connected assembly of the drawbar 6 in which a circumferential gap gap 6.1 left open. In this gap 6.1 the middle tube moves 9 ,

The aforementioned assembly is with the chassis 37 of the trailer 4 connected, in the case shown without a turntable. The middle tube 9 is at its free end with a drawbar eye 35 provided, which is in a conventional trailer hitch of a trailer hitch, for example, the construction of the company Rockinger, used and there is releasably held.

On the drawbar 6 is a coupling device 6.2 put on with a coupling pin 13 connected in the vertical direction with respect to the axial direction of the tubes 7 - 9 is displaceable. To move the coupling bolt 13 serves a locking lever 38 , The three pipes 7 . 8th . 9 each have at their top one in the 5 and 6 illustrated hole 10 . 11 respectively. 12 on, through which the coupling bolt 13 can be stuck when the holes 10 . 11 . 12 with appropriate position of the pipes 7 . 8th . 9 to escape. In this locked state is the drawbar 6 long and serves the normal transport and driving condition (see. 6 ).

When the trailer has reached a discharge or parking position, the drawbar 6 be shortened. With the help of the locking lever 38 First, the coupling pin 13 pulled out of its locking position so high that the lock between the three tubes 7 . 8th and 9 is solved and the middle tube 9 between the pipes 7 and 8th is freely movable.

Then the trailer tow from the driving mode ( 1 ) with the long drawbar 6 ( 2 ) into the charging mode ( 3 ) with the shortened drawbar ( 4 ). The motor car 1 Sit back and push it, with locked standing trailer 4 , the middle drawbar tube 9 in between the outer and inner tube 7 respectively. 8th located gap 6.1 back.

5 shows that at the beginning of moving in the direction of arrow P1, the middle drawbar tube 9 so far moved that the center axis M1 of the holes 10 and 11 no longer with the center axis M2 of the hole 12 coincides.

In the course of the motor car pushes the drawbar tube 9 so far back to one on the middle drawbar tube 9 attached stop point 39.1 to one, on the inner and outer drawbar tube 7 . 8th attached assembly mounted stop point 39.2 strikes ( 4 ).

3 shows that in the position thus defined, which represents the charging mode, only a minimum distance between motor vehicle 1 and followers 4 is given and the loading and / or unloading process can be performed.

After completing the loading work, the motor car drives 1 while pulling the middle drawbar tube 9 in the direction of P2 ( 5 ).

When retracting and extending the pipe 9 from the position according to 5 is the coupling pin 13 only partially pulled out, namely so far that the tube 9 is movable. The coupling pin 13 is locked in this position in its vertical position and does not drag on the pipe 9 in the direction of arrow P2 relative to the other two tubes 7 and 8th is moved.

For the unlocking of the coupling pin a special function is provided. 5 shows that the middle tube 9 in addition to his drilling 12 a thickening 14 having the pipe diameter. An inserted part of the pipe 9 diminished before drilling 12 the distance to the lower end of the coupling bolt 13 , The coupling pin 13 comes just before the coincidence of the three holes 10 . 11 . 12 with the thickening 14 in contact and lifts the lock of the coupling bolt, so that the coupling pin 13 again through all three holes can occur as soon as the middle tube 9 pulled out so far that the holes 10 . 11 . 12 to be in flight.

By briefly lifting the coupling pin 13 , triggered by the thickening 14 , which may preferably also be a wear plate, one thus far releases the coupling pin 13 locked holding spring rocker of the coupling device 6.2 , By the pressure of the compression spring closes with the spring rocker 6.3 connected coupling bolts 13 and locks the pipes against each other. Triggerable coupling bolts are known per se, but not in connection with length-adjustable drawbars.

The coupling pin 13 engages and creates a rigid connection between the towing vehicle and trailer chassis with a long drawbar. The entire train has now reached the driving mode and can then be driven forward together.

The box bodies 2.1 and 2.2 can also be used as so-called "exchangeable cases" 2 ' be executed. Such exchangeable cases 2 ' are usually not shown container closures with the chassis of motor vehicles 1 or trailer 4 connected. As far as a discontinuation of the exchangeable case 2 ' from motor vehicle 1 or trailer chassis 4 is required, the container closures connecting the superstructures with the chassis are previously solved and the superstructures on the body post 40 set up ( 7 ). The from motor car 1 and trailer chassis 37 existing train can then under the exchangeable bodies 2 ' drive out.

The inclusion of on parking stands 40 immediately after one another set up trunks 2 ' is essentially reciprocal: first, the one out of motor car 1 and trailer chassis 37 existing train so far under the bodies driven until the trailer chassis 37 completely under the front, for the motor car 1 provided box body 2.1 located. Thereafter, via the locking lever 38 the coupling pin 13 for unlocking the coupling device 6.2 swung up and cocked.

Then the motor car drives 1 further back and pushes the middle drawbar tube 9 so far back, until the anchor point 39.1 at the anchor point 39.2 encounters.

motor car 1 and trailer chassis 37 are so far together under the superstructures 2.1 and 2.2 driven until a position has been reached, in which the container closures of the superstructures 2.1 and 2.2 in the field of on motor vehicles 1 and trailer chassis 37 located counterparts are located. The superstructures 2.1 and 2.2 can then in a known manner on towing vehicle 1 and trailer chassis 37 be recorded and connected with them.

Then the motor car drives 1 before, pull the middle tube 9 the drawbar 6 until the automatic coupling by passing over the thickening 14 through the coupling pin 13 is triggered, it disengages and the system is thereby converted into the drive mode. Then the whole train can start or continue its journey.

Regardless of whether the, preferably driven backwards in front of a loading ramp, and pushed together in the manner described to a common unit, structures on motor vehicles 1 and trailer chassis 37 or on body post 40 are discontinued, a discharge or loading process can be performed.

This is the rear sectional door 3 of the rear construction 2.2 opened, so that the rear bodywork can be driven or committed. The discharge is usually done with this customary tools, such as smaller industrial trucks, the size and weight of the use in the interior of a box body 2 are suitable and in particular can lift and transport pallets.

First, the rear box body 2.2 completely discharged. After that becomes a blocking element 34 of opposite the sectional door 3 lying folding doors 5 solved. The latter consists of a lower door element 17 as well as one with this over a hinge 21 connected upper door element 16 which is in the storage points 18 and 19 in the front area of the box body 2 is stored below the box body roof ( 8th and 9 ). By Pull on at least one of the hinges 21 located handles 15 becomes the folding gate 5 slightly bent inwards.

Like the detail drawing 10 shows, while the upward movement of the folding door 5 supported by the power of one in a groove 43 of the soil mounted compression spring 45 inside a height-adjustable cylinder 44 is arranged. After the folding gate 5 in the middle region is buckled so far that the safety pin 42 of the lower door element 17 the groove 43 has completely left, the cylinder closes 44 , supported by the compression spring 45 , the groove 43 and thus prevents contamination of the groove 43 , In place of a safety bolt 42 can also be provided a fuse strip, which then engages in a correspondingly long groove in the bodywork. The lower door element 17 has guide pins on both sides in the lower area 22 which are vertical in with the side walls 23 of the box body 2 connected guide rails 24 are guided.

Furthermore, in the area of an upper corner of the folding door 5 ( 7 - 9 ) a lifting rope 25 at an anchor point 26 attached. This lifting rope 25 is initially down to the side of the folding door 5 inside the guide rail 24 along and then around one in the foot area of the lower door element 17 lying guide on the guide pin 22 led around. From there, the lifting rope runs 25 at the side of the folding gate 5 also within the guide rail 24 upwards and is in the area of the inner, upper corner of the box body of a guide 29 deflected and above the folding door to the similarly mounted on the opposite, inner, upper corner guide 29 ' guided. From there, the rope runs back inside the guide rail 24 ' downwards, over the guide on the guide pin 22 ' around and then up again, inside the guide rail, to the anchor point 26 ' led, where it is firmly connected to the box body. So that the lifting rope 25 the guide 29 ; 29 ' does not leave, is the length of the hoisting rope 25 such that when the folding door is closed 5 one by the weight of the folding door 5 applied force for a light tension of the hoisting rope 25 provides.

To the hoist 25 is about a tee 25.1 a second rope 27 , in the following pull rope 27 , called tailed ( 8th ), which is covered with a sled 46 below the box body roof 20 in a guide rail continue on a below the box body roof 20 attached support element 30 from the folding gate 5 is led away.

The rope 27 ends in a handle loop 41 , Will be on the handle loop 41 pulled, so is at the same time at the point P of the hoisting rope 25 drawn. The rope 27 pulls the two strands of the hoisting rope 25 , forcibly guided via center-left and right-mounted deflection points 47 , with the sledge 46 through the guide rail via the support element 30 and lifts the guide pins 22 and 22 ' at the folding gate at the bottom. The further the pull rope 27 is pulled, the higher the guide bolts 22 and 22 ' in the guide rail 24 guided, with the upper and lower door element 16 . 17 against each other more and more folded inwards.

In the final position is the folding goal 5 completely collapsed and hangs as a door swung upwards 33 in the interior of the box body below the box body roof 20 , The rope 27 can with the help of one on the sled 46 located latching device 31 fixed and the folding gate 5 be kept in the open position. The locking device 31 . 32 For example, from a sled 46 attached locking bolts 31.1 exist, which after swinging the folding door 5 in one for this locking bolt 31.1 provided hole 32.1 in the below the construction roof 20 attached latching device 32 is hooked.

Subsequently, the now accessible sectional door 3 of the box body 2 of the motor car 1 open.

Since the front and rear box body are directly behind each other, the passage between the two bodies is now possible and the front box body can be unloaded. Bridging the minimum gap between the collapsed structures 2.1 . 2.2 is usually not required, but can be made possible if necessary with the help of a carrying board.

The closing of the folding door is done after releasing the locking device 31 . 32 , This happens, for example, by a compression spring, which is the two parts of the locking device 31 and 32 clamped together, temporarily released manually and thus the withdrawal of the traction cable 27 is possible. The dead weight of the two door elements 16 . 17 causes their unfolding, the trajectory of the in the guide rails 24 . 24 ' guided guide pin 22 . 22 ' is forcibly controlled. When reaching the end position presses on the underside of the lower door element 17 located safety bolts 42 against the cylinder 44 and against the inside of the cylinder 44 located compression spring 45 , The weight of the folding door on the cylinder 5 pushes the compression spring 45 together, leaving the safety bolt 42 in the groove located in the bottom of the box body 43 locks.

After closing the blocking element 34 puts the folding gate 5 such a compact and robust unit, which is also resistant to such loads, as caused for example by moving due to a braking maneuver cargo.

As an alternative to the swiveling of the folding door on the basis of a cable pull technique explained in the example, another solution, such as a rack and pinion technology with gears, can be provided for this purpose.

The principle of folding doors 5 is also on the side walls of a box body 2 applicable, wherein the folding of upper and lower door element ( 16 ; 17 ) in this case, not in the direction of the interior of the box body 2 takes place, but towards the outside.

LIST OF REFERENCE NUMBERS

1

motor car

2

Kofferaufbau

2 '

Wechselkoffer

2.1

on a motor vehicle befindlicher box body

2.2

on a trailer chassis befindlicher box body

3

sectional

4

pendant

5

Folding Door

6

variable length drawbar

6.1

spacing gap

6.2

coupling device

6.3

swing arm

7

outer tube

8th

inner tube

9

middle tube

10

Bore in the outer tube

11

Bore in the inner tube

12

Hole in the middle tube

13

coupling pin

14

thickening

15

handle

16

Upper door element

17

lower door element

18

Bearing point L1

19

Bearing point L2

20

Kofferaufbau roof

21

hinge

22

guide pins

22 '

guide pins

23

Side wall

24

guide rail

24 '

guide rail

25

lifting rope

25.1

Tee

26

Cable anchorage point

26 '

Cable anchorage point

27

rope

28

support element

29

guide

29 '

guide

30

support element

31

locking device

31.1

Indexing plungers

32

Counterpart latching device

32.1

drilling

33

door swung upwards

34

blocking element

35

drawbar

36

attachments mouth

37

trailer chassis

38

locking lever

39.1

Tiller anchor point 1

39.2

Tiller anchor point 2

40

structural support

41

handle loop

42

safety bolt

43

groove

44

cylinder

45

compression spring

46

carriage

47

turning point

P

attackpoint

M1

Center axis of the holes 10 and 11

M2

Center axis of the hole 12

P1

arrow

P2

arrow

Claims (14)

Length adjustable drawbar ( 6 ) for a truck trailer with a towing vehicle ( 1 ), a box body ( 2 ) and in which at least the rear wall of the box body can be opened, and a trailer ( 4 ), which also has a box body ( 2 ) and in which both the front wall and the rear wall are openable, the motor vehicle ( 1 ) and the trailer ( 4 ) over the variable-length drawbar ( 6 ) are connectable to each other, characterized in that the variable-length drawbar ( 6 ) an outer tube ( 7 ) and an outer tube fixedly connected to the inner tube ( 8th ) and an intermediate, in the longitudinal direction relative to the outer and inner tube displaceable middle tube ( 9 ). Tiller according to claim 1, characterized in that the three pipes ( 7 ; 8th ; 9 ) via at least one bore located at the top of the tubes ( 10 ; 11 ; 12 ) for receiving a common coupling pin ( 13 ) are suitable. Tiller according to claim 2, characterized in that the bores in the outer tube ( 7 ) and inner tube ( 8th ) are arranged on a common central axis (M1), wherein the central axis of the bore of the central tube (M2) in the driving mode on the central axis (M1). Tiller according to claim 2 or 3, characterized in that the pipe arrangement a movable, from one into the holes ( 10 ; 11 ; 12 ) Retracted detent position in a drawbar release position sliding coupling pin ( 13 ) assigned. Tiller according to claim 4, characterized in that the middle tube ( 9 ) in the area in front of the hole ( 12 ) one the dome bolt ( 13 ) when inserting the middle tube lifting thickening ( 14 ), which from the bore region of the holes ( 11 ) and ( 12 ) pulled and locked in drawbar release position coupling bolt ( 13 ) shifts to a position releasing its lock. Tiller according to claim 5, characterized in that the thickening ( 14 ) is designed as a replaceable wear plate. Truck trailer with a towing vehicle ( 1 ), a box body ( 2 ) and in which at least the rear wall of the box body can be opened, and a trailer ( 4 ), which also has a box body ( 2 ) and in which both the front wall and the rear wall are openable, characterized in that the motor vehicle ( 1 ) and the trailer ( 4 ) via a length-adjustable drawbar ( 6 ) are interconnected according to one of claims 1-6. Truck trailer haulage according to claim 7, characterized in that the box body of motor vehicle ( 1 ) and / or trailers ( 4 ) Is designed as a swap body construction. Door for a box body ( 2 ) of a truck trailer haulage according to claim 8, wherein the truck trailer haulage a motor vehicle ( 1 ) and a trailer ( 4 ), wherein at least the rear wall of the box body ( 2 ) can be opened, the below the box body roof ( 20 ) at storage points ( 18 ; 19 ) is pivotally mounted, wherein at least two door elements ( 16 ; 17 ) via a hinge ( 21 ), characterized in that the towing vehicle ( 1 ) and the trailer ( 4 ) via a length-adjustable drawbar ( 6 ) are connected. Door for a box body according to claim 9, characterized in that the lower door element ( 17 ) on its underside lateral guide pins ( 22 ) with one on the side wall ( 23 ), vertical guide rail ( 24 ) and forcibly control the upward and downward movement of the collapsible door elements, and wherein the folding and upward pivoting of the door elements ( 16 ; 17 ) by pulling a pull rope ( 27 ), which in the movable point (P) via a tee with a split lifting rope ( 25 ) connected to the lower door element ( 17 ) connected is. Door for a box body according to one of claims 9 to 10, characterized in that a lifting cable ( 25 ) - in the area of an upper corner of the folding door ( 5 ) at an anchor point ( 26 ) is firmly attached, - from there on the side of the folding door along down and around the guide pin ( 22 ) or a corresponding guide is guided around - from there to the side of the folding door ( 5 ) upwards and with the aid of a guide device (in the area of the inner, upper corner of the box body) ( 29 ) is deflected, - from there above the folding door to the similarly mounted on the opposite, inner, upper corner guide 29 ' - from there deflected and again at the side of the folding door ( 5 ) downwards, - from there to the guide pin ( 22 ' ) or a corresponding guide is guided around - and from there upwards to the anchor point 26 ' guided, is - where it is firmly connected to the box body. Door for a box body according to one of claims 9 to 11, characterized in that the traction cable ( 27 ) via a latching device ( 31 ) fitted with a counterpart attached to the ceiling of the box body ( 32 ) and the upwardly pivoted door elements ( 16 . 17 ) fixed after locking. Door for a box body according to one of claims 9 to 12, characterized in that the lower door element in the fully swung-out position in a groove located in the bottom of the box body ( 43 ) attacks. Door for a box body according to one of claims 9 to 13, characterized in that a blocking element ( 34 ) locks the door in the swiveled position.

Images